Rotary rock drill



Patented May 25, 1926.

UNI-TED .STATES JOBEBH HENBITZI, 0F SOKANE, WASHINGTON.

ROTARY ROCK DRILL.

e, Application led Januarir 23, 1924. Serial No. 688,068.

1 YThis invention pertains` to rotaryV rock drills, and has foritspurpose to improve Adrills of the character mentioned.

This invention is especially intended to r provide supports forthe bits.

The invention will be hereinafter particularly described, pointed out inthe claim and illustrated in the accompanying drawings,

in which Figure 1 is a central longitudinalsectional view ofa drill pipeembodying the invention, Figure 2 is alike sectional view taken at rightangles to Figure 1, Figure 3 is a transverse sectionalview taken on theline 3 3 of Figure 1, Figure 4 is a transverse sectional view takenontheline 4-4 of Figure 1, Figure 5 is an elevation of one form of bitused in the construction, Figure 6 is'a plan View of the same, Figure'7-is a sectional View taken on the line 7-7" of Figure 6, Figure 8 is anelevation of another form of bit used in the construction, Figure 9 is aplan view of the same, Figure 10.is a plan view of one of a set of ringsmounted l adjacent the bearings of the bits to protect them from dirt,grit and sand,Figure 11 is a side. view of the same, Figure 12 is a planView of one of a set of roler pinions mounted in the frame in such vamanner as -to support the lower set of bits and Figure 13 is a side viewof the same. This invention' is an improvement upon the constructionshown in the'patent issued to me on September 11, 1923 Number 1,467,479, wherein I show a drill pipe 10 with oppositely disposed walls 11,thickened for some distance up from the bottom as shown in Figure 2, atthe bottom of which are langular siafts 1-2 upon which are rotatablymounted cone Mounted on the lower end of the'pipe 10, oppositelydisposed and between the thickened walls 11, are two jaws 14 and 15having beveled surfaces 16, the two being hinged together on the shaft17 extending transversely'through the thickened walls 11. The lower endsof thejaws 14 and` 15 are formed into an ular'shafts 18 andon theseshafts are rotatab y mounted cone bits 20. Sus ended into the pipe 10are wedges 22, broug t to a bits 13.

feather edge 23. at the bottom and ada tedl .to find-their way betweenthe pipe 10A an the louter surfaces of, the upper ends of the jaws 14and 15, thepurpose being to force the upper 'endsof v thejaws 14 Vandl'together` 'and thereby spread or expand the bits 20.

Two sets of bits are thus provided, the lower set drilling a pilot holeand the upper, set in the expanded position drilling the hole larger. Inhave `improved- Athe invent-ion by providing .means for supporting andadding to the strength of the lower set of bits 13 by mounting rollerpinions 24 rotatably on a transverse shaft 25, such pinions-being incontinuous frctional contact with the surface'26 of tliebits 13. I havefurther improved the -invention by mortising annular rings 27 into theconstruction and surrounding'both sets of 'shafts 12 and 18 with thesame in suchf'a manner as to protect the said shafts froml dirt, gritand sand getting to thel same through the openings between the shaftsand? bits. I have still further improved thefinv'ention by providing twovarieties of bits of different cuttingedges, one form being illustratedby Figures 5, 6 and 7, the 4 fs'ajne having transversely arrangedoutting'edges 28 and the other form illus= trated in F igures 8 and 9,the same being provided with annular cutting edges. 29. One each ofthese bits is installed in each set 12 and 20 whereby the material beingdrilled is cut first by `grinding in one direcltionloy one form of bitand then cross-cut by grinding cross-ways thereof by the other form ofbit,

What is claimed is: In rotary rock drills having Cone bits rotatablymounted on shafts supported by a frame, idler pinions rotatably mountedin the frame above the bits and on. aseparate shaft therefrom and insuch a manner as to bring the same into continuous frictional fescontact withthe surface of the bits and to provide a support for thesame. Y

In testimony whereof, I aix my signature. e

J OSEPII HENRITZI.

